Will the NEW style T-MAXX .15 motor fit in the OLD style T-MAXX .15 chassis? I have the old style and my buddy might move up to a .21 motor and sell me his pumped up .15 motor, my concern is his motor won't work in my chassis because that is the new motor and mine is the old style chassis. I don't want to go through the hassle and money of changing chassis if I'm going to have the same motor, just an updated version. If that is the case, would it be more worth it just to go all out myself buy a new .21 motor and chassis to go with it? Thanks for any help.